KR101741751B1 - Refrigerator having cool airflowload damper apparatus and controlling method for the same - Google Patents

Refrigerator having cool airflowload damper apparatus and controlling method for the same Download PDF

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Publication number
KR101741751B1
KR101741751B1 KR1020150086139A KR20150086139A KR101741751B1 KR 101741751 B1 KR101741751 B1 KR 101741751B1 KR 1020150086139 A KR1020150086139 A KR 1020150086139A KR 20150086139 A KR20150086139 A KR 20150086139A KR 101741751 B1 KR101741751 B1 KR 101741751B1
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KR
South Korea
Prior art keywords
damper
refrigerator
housing
freezing prevention
freezing
Prior art date
Application number
KR1020150086139A
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Korean (ko)
Other versions
KR20160149085A (en
Inventor
김효수
Original Assignee
동부대우전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 동부대우전자 주식회사 filed Critical 동부대우전자 주식회사
Priority to KR1020150086139A priority Critical patent/KR101741751B1/en
Priority to US14/881,119 priority patent/US10161666B2/en
Priority to CN201510677112.5A priority patent/CN106257191A/en
Publication of KR20160149085A publication Critical patent/KR20160149085A/en
Application granted granted Critical
Publication of KR101741751B1 publication Critical patent/KR101741751B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
    • F25D17/08—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation using ducts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
    • F25D17/042—Air treating means within refrigerated spaces
    • F25D17/045—Air flow control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/14—Collecting or removing condensed and defrost water; Drip trays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/04—Preventing the formation of frost or condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/02—Refrigerators including a heater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/06—Refrigerators with a vertical mullion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)

Abstract

Disclosed is a technique capable of removing a condensation phenomenon around a damper in a refrigerator having a cold air flow path damper device.
The present invention relates to a damper driving apparatus comprising: a damper driving unit; A housing having a pivot axis extending from the damper driving unit along the longitudinal direction; A damper that is rotated along the rotation axis by driving the damper driving unit to open / close the cooling air flow passage opening of the housing; A freezing prevention pad attached to an upper surface of the damper in an area adjacent to the inner surface of the housing; And a freezing prevention member fixedly mounted in the form of being inserted into the freezing prevention pad.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a refrigerator having a cool air flow path damper device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and more particularly, to a refrigerator having a cooling-air flow path damper device suitable for preventing icing of a damper for opening and closing a cooling-air flow path, and a driving method thereof.

A refrigerator is a device intended for low-temperature storage of food, and can be configured to refrigerate or store food according to the type of food to be stored.

The interior of the refrigerator is cooled by the continuously supplied cold air, and the cold air is continuously generated by the heat exchange action of the refrigerant by the refrigeration cycle through compression-condensation-expansion-evaporation process. The cold air supplied to the inside of the refrigerator is uniformly transferred to the inside of the refrigerator by the convection so that the food inside the refrigerator can be stored at a desired temperature.

Generally, a refrigerator body is in the form of a rectangular parallelepiped having a front opening, and a refrigerator and a freezer may be provided inside the refrigerator body. In addition, a refrigerator compartment door and a freezer compartment door for selectively shielding the opening portion may be provided on the front surface of the main body, and a plurality of drawers, a shelf, and a storage box for storing various foods in an optimum state can be stored in a storage space inside the refrigerator .

Conventionally, a top mount type refrigerator in which a freezing compartment is located on the upper side and a refrigerating compartment is located on the lower side has been the mainstream. In recent years, however, a bottom freeze type refrigerator Is also being released.

In the case of a refrigerator adopting a structure in which cool air supplied to the refrigerator is uniformly transferred to the inside of the refrigerator and the cool air in the freezer room is introduced into the refrigerator through the cool air discharge channel, a damper for opening and closing the cool air channel is provided between the freezing chamber and the refrigerating chamber .

The damper is installed in a barrier for partitioning the freezer compartment and the refrigerating compartment and serves to form or shut off the refrigerant passage for providing the cold air of the freezing compartment to the refrigerating compartment by the opening and closing operation. Generally, the damper maintains a closed state during the refrigeration cycle, and when the temperature of the refrigerating compartment rises to a predetermined temperature or more, the damper operates to open the refrigerating compartment for providing the cold air of the freezing compartment to the refrigerating compartment have.

At this time, when the damper is closed, since the freezing chamber and the refrigerating chamber are separated from each other by the barrier, dew condensation occurs in the periphery of the damper (for example, damper housing) due to the temperature difference between the refrigerating chamber and the freezing chamber (Condensation) phenomenon may occur.

In this state, when the damper is opened to form the cool air flow path, the temperature around the damper on the cool air flow path is rapidly changed, and the previously formed dew-point water drops into ice.

Although it is possible to remove ice adhered to the damper itself by providing a heating function of the damper itself, it is impossible to remove the ice from the adjacent region between the damper housing and the damper. Therefore, There arises a problem that interference occurs due to the interference of the light.

According to the embodiment of the present invention, there is provided a refrigerator having a cooling-air flow path damper device capable of previously removing condensation phenomenon occurring in an adjacent region between a cooling-air flow path damper and a damper housing during opening and closing operations of a refrigerator- .

According to an embodiment of the present invention, a damper driving unit; A housing having a pivot axis extending from the damper driving unit along the longitudinal direction; A damper that is rotated along the rotation axis by driving the damper driving unit to open / close the cooling air flow passage opening of the housing; A freezing prevention pad attached to an upper surface of the damper in an area adjacent to the inner surface of the housing; And a freezing prevention member fixedly mounted in the form of being inserted into the freezing prevention pad.

Here, the freezing prevention member can remove water generated on the inner surface of the housing.

In addition, the freezing prevention member may have a shape that induces the water generated on the inner surface of the housing to flow downward.

Further, the frost preventing member may be an elastic material.

In addition, the elastic material may include any one material of rubber or silicone.

According to an embodiment of the present invention, there is provided a refrigerator comprising: a refrigeration cycle of a refrigerator; sensing an internal temperature of the refrigerator; controlling the damper to be opened when the internal temperature of the refrigerator is higher than a predetermined temperature, And preventing a condensation phenomenon around the cool air passage of the damper due to the freezing prevention member mounted on the upper surface of the damper.

Here, the internal temperature may be an internal temperature of the refrigerating compartment.

Further, the frost preventing member may be an elastic material.

In addition, the elastic material may include any one material of rubber or silicone.

According to the present invention, the water (condensation phenomenon) occurring in the adjacent area between the cold airflow path damper and the damper housing can be removed before the opening and closing operation of the airflow path damper, so that it is caused by the rapid temperature change when the damper is opened The icing phenomenon can be prevented in advance.

As a result, it is possible to prevent weak cooling (high temperature relative to the setting) and undercooling (low temperature relative to the setting) of the refrigerating compartment, and consumer complaints caused by the freezing of the refrigerator can be solved.

1 is a perspective view of a refrigerator in which a cold air flow path damper device according to an embodiment of the present invention is mounted,
FIG. 2 is a detailed block diagram of a cold air flow path damper device according to an embodiment of the present invention,
3 is a view exemplarily showing the case where the damper is opened in the cold airflow path damper device of FIG. 2,
FIG. 4 is a side cross-sectional view of a damper to which a frost preventing pad and a frost preventing member are mounted in the cool air flow path damper device according to the embodiment of the present invention,
FIG. 5 is a system control configuration diagram for driving a damper of a cold airflow path damper device according to an embodiment of the present invention; FIG.
6 is a flowchart exemplarily illustrating a method of driving a refrigerator having a cold air flow path damper device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a perspective view of a refrigerator in which a cold air flow path damper device according to an embodiment of the present invention is mounted.

1, the refrigerator 1, which is illustratively applied in the embodiment of the present invention, includes a main body 2 forming an outer appearance, a food storage space formed inside the main body 2, A freezing chamber door (3) provided on both side edges of the front surface of the main body (2) and selectively shielding the freezing chamber (R) by rotational motion, a freezing chamber And a freezing chamber door (5) for shielding the front opening of the fuel cell (F).

The cool air flow path damper device 100 according to the embodiment of the present invention can be installed on the barrier 4. The cool air in the freezing room F can be cooled by the opening and closing operation of the damper in the damper device 100, And a cooling air flow path for providing the cooling air flow path.

A damper for opening and closing the cool air passage is provided between the freezing chamber F and the refrigerating chamber R in the case of a refrigerator adopting a structure in which cool air of the freezing chamber F flows into the refrigerating chamber R through the cold air discharge passage This damper is kept closed during the refrigeration cycle and is opened when the temperature of the refrigerating compartment R is raised to a predetermined temperature or higher so that the cool air of the freezing compartment F is supplied to the refrigerating compartment R The cooling air flow path for providing the cooling air flow path can be formed.

As is known, a cooler including a compressor (not shown), a condenser, an expansion valve, and an evaporator may be provided in order to generate cool air in a refrigerator. The cooler generates heat by exchanging the coolant and air through the cooler.

2 is a detailed block diagram of this cold air flow path damper device 100 and can be largely constituted by a housing 102 and a damper 104. The housing 102 is provided with a damper driving part 10, And a frost preventing pad 106 and a frost preventing member 108 may be formed on the upper end of the damper 104 according to the embodiment of the present invention. Although the embodiment of the present invention has been described in the context of the formation of the anti-frosting pad 106 and the anti-freezing member 108 on the upper end of the damper 104, this is only an example for helping understanding of the embodiment, It is to be understood that the damper 104 may be selectively formed on the left / right side or the lower side of the damper 104 depending on where a large amount of water is formed.

FIG. 3 is a view illustrating an example in which the damper 104 is opened in the cold airflow path damper device 100 of FIG. 2. FIG. 4 is a cross-sectional view of the airflow path damper device 100 according to the embodiment of the present invention, Sectional view of the damper 104 on which the anti-frost member 106 and the anti-frost member 108 are mounted.

Hereinafter, the cold-air-flow channel damper device 100 according to the embodiment of the present invention will be described in more detail with reference to FIG. 2 to FIG.

2, the housing 102 of the cooling-air flow path damper device 100 has a structure capable of accommodating the damper 104 and includes a damper drive unit 10 for rotating the damper 104, And a rotating shaft 12 extending from the rotating shaft 10 along the longitudinal direction of the damper 104.

Here, the damper driving unit 10 may be composed of, for example, an electric motor, a solenoid, an actuator, or the like. Therefore, the damper 104 is rotated along the rotation axis 12 by the driving of the damper driving unit 10, so that the opening / closing operation is possible.

The freezing prevention pad 106 and the freezing prevention member 108 are provided on the upper end of the damper 104 according to the embodiment of the present invention.

The freezing prevention pad 106 is for fixing the freezing prevention member 108 and is configured to be attached to the upper surface of the damper 104.

The freezing prevention member 108 is fixedly mounted by the freezing prevention pad 106 and the water which can be formed in the adjacent portion of the housing 102 of the cooling airflow path damper device 100 as the pad 104 is opened and closed .

For example, when the damper is closed, since the freezing chamber F and the refrigerating chamber R are separated from each other by the barrier 4, the temperature difference between the refrigerating chamber R and the freezing chamber F causes the damper 104 Dew condensation may occur in the vicinity of the damper 104 (for example, the upper surface of the damper 104 and the portion of the housing 102 adjacent to each other).

In this state, as shown in Fig. 3, when the damper 104 is opened to form the cool air flow passage, the temperature around the damper on the cool air flow passage opening 16 is drastically changed, and dew- A changing icing phenomenon may occur.

Therefore, in the embodiment of the present invention, when the damper 104 is opened and closed, the moisture formed on the inner surface of the housing 102 adjacent to the upper surface of the damper 104 is prevented from freezing So that the member 108 can be removed.

4 is a side sectional view of a damper 104 on which a frost preventing pad 106 and a frost preventing member 108 are mounted in a cool air flow path damper device 100 according to an embodiment of the present invention.

4, the freezing prevention pad 106 is attached to the upper end surface of the damper 104 to fix the freezing prevention member 108. As shown in Fig.

The anti-freeze member 108 can be inserted into the anti-freeze pad 106 in the form of a funnel. By virtue of this shape of the anti-frost member 108, the water can easily flow down to the lower portion in removing the water formed on the inner surface of the housing 102 adjacent to the upper surface of the damper 104. [

Since the frost preventing member 108 may be made of an elastic material such as rubber or silicon and is mounted integrally with the damper 104 in an area adjacent to the inner surface of the housing 102, The water formed on the inner surface of the housing 102 can be removed.

On the other hand, the front surface of the damper 104 is further provided with an electric heater 14 so as to suppress the occurrence of restraint of the damper 104 due to freezing. Here, it is preferable that the electric heater 14 is constituted by a small-capacity heater having a small heat generation amount in consideration of power consumption and freezing load. That is, the electric heater 14 is formed so as to have a heat generation capacity enough to suppress the occurrence of restraint by the freezing of the damper 104. In addition, the electric heater 104 may be configured to be powered on at all times or to be periodically powered.

5 is a system control configuration diagram for driving the damper 104 of the cooling airflow path damper device 100 according to the embodiment of the present invention. The temperature sensor 20, the control unit 22, the damper driving unit 10, . ≪ / RTI >

5, the temperature sensing unit 20 is installed in the refrigerator 1 to sense the temperature of the freezing room F and the refrigerating room R and to apply sensed temperature data to the control unit 22 have.

The control unit 22 compares the temperature data provided from the temperature sensing unit 20 with predetermined temperature data and applies a damper driving command to the damper driving unit 10 when the current temperature data is larger than the predetermined temperature data can do.

The damper drive unit 10 rotates the rotary shaft 12 by driving the electric motor and the actuator in response to the damper drive command of the control unit 22. The damper drive unit 10 thus rotates the damper 104 extending from the rotary shaft 12, Closing operation.

Hereinafter, a method of driving the refrigerator 1 having the cooling airflow path damper device 100 according to the embodiment of the present invention will be described with reference to the flowchart of FIG. 6, together with the configuration of FIG.

6, when the refrigeration cycle of the refrigerator 1 proceeds (S100), the controller 22 can receive the temperature data sensed through the temperature sensing unit 20 (S102).

The control unit 22 determines whether the temperature data of the refrigerating compartment R provided from the temperature sensing unit 20 is greater than the predetermined temperature data at step S104, The driving command for opening the damper 104 can be applied to the damper driving unit 10 (S106).

The standard for opening the damper 104 is an example and the temperature difference between the freezing room F and the refrigerating compartment R in addition to the temperature data of the refrigerating compartment R and the temperature difference between the freezing compartment F and the refrigerating compartment R, And the number of times the door is opened and closed can be applied as an open condition of the damper 104, as will be readily apparent to those skilled in the art.

On the other hand, according to the damper open drive command of the control unit 22, the damper drive unit 10 is driven to rotate the rotary shaft 12, and the damper 104 extending along the rotary shaft 12 is opened and closed, (S108).

While the present invention has been described with respect to specific embodiments of the cold-air-flow channel damper device and the driving method therefor according to the embodiments of the present invention, the present invention is not limited thereto. For example, Should be interpreted as having a range of. Skilled artisans may implement a pattern of features that are not described in a combinatorial and / or permutational manner with the disclosed embodiments, but this is not to depart from the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1: Refrigerator 2: Body
3: Refrigerator door 4: Barrier
5: Freezer door R: Refrigerator room
F: freezer compartment 100: cold air flow damper device
102: housing 104: damper
106: anti-freezing pad 108: anti-freezing member
10: damper drive unit 12:
14: electric heater 16: cold air flow passage opening
20: temperature sensing unit 22:

Claims (9)

A damper driving unit;
A housing having a pivot axis extending from the damper driving unit along the longitudinal direction;
A damper that is rotated along the rotation axis by driving the damper driving unit to open / close the cooling air flow passage opening of the housing;
A freezing prevention pad attached to an upper surface of the damper in an area adjacent to the inner surface of the housing; And
And a freezing prevention member fixedly mounted in the form of being inserted in the freezing prevention pad,
Wherein the freezing prevention member is formed in a funnel shape with a structure that removes water generated on a portion of the inner surface of the housing adjacent to the upper end surface of the damper and becomes thinner toward the upper portion.
delete The method according to claim 1,
Wherein the freezing prevention member has a shape that induces the water generated on the inner surface of the housing to flow downward
Refrigerator.
The method according to claim 1,
Characterized in that the freezing prevention member is an elastic material
Refrigerator.
5. The method of claim 4,
Wherein the elastic material comprises a material selected from the group consisting of rubber and silicon
Refrigerator.
Performing a refrigeration cycle of the refrigerator;
Sensing an internal temperature of the refrigerator;
And controlling the damper to be opened when the internal temperature of the refrigerator is higher than a predetermined temperature to form a cool air channel from the freezing chamber to the refrigerating chamber of the refrigerator,
Preventing condensation from occurring around the cool air passage of the damper due to the freezing preventing member mounted on the upper surface of the damper,
The freezing prevention member is formed in a funnel shape having a structure that removes water generated in a portion of the damper adjacent to the upper end surface of the damper in the vicinity of the cool air flow passage and becomes thinner toward the upper end
How to drive a refrigerator.
The method according to claim 6,
Wherein the internal temperature is an internal temperature of the refrigerating compartment
How to drive a refrigerator.
The method according to claim 6,
Characterized in that the freezing prevention member is an elastic material
How to drive a refrigerator.
9. The method of claim 8,
Wherein the elastic material comprises a material selected from the group consisting of rubber and silicon
How to drive a refrigerator.
KR1020150086139A 2015-06-17 2015-06-17 Refrigerator having cool airflowload damper apparatus and controlling method for the same KR101741751B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1020150086139A KR101741751B1 (en) 2015-06-17 2015-06-17 Refrigerator having cool airflowload damper apparatus and controlling method for the same
US14/881,119 US10161666B2 (en) 2015-06-17 2015-10-12 Cool air path damper assembly with elastic anti-freezing member
CN201510677112.5A CN106257191A (en) 2015-06-17 2015-10-19 Cold air channel damper assemblies with flexible antifreeze component

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150086139A KR101741751B1 (en) 2015-06-17 2015-06-17 Refrigerator having cool airflowload damper apparatus and controlling method for the same

Publications (2)

Publication Number Publication Date
KR20160149085A KR20160149085A (en) 2016-12-27
KR101741751B1 true KR101741751B1 (en) 2017-05-31

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US (1) US10161666B2 (en)
KR (1) KR101741751B1 (en)
CN (1) CN106257191A (en)

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